Multiple Choice
In osmosis across a selectively permeable membrane, the net movement of water is always from a region with which condition to a region with the opposite condition?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which statement best defines osmosis in the context of passive transport across a selectively permeable membrane?
A
The bulk movement of extracellular fluid and dissolved molecules into a cell via vesicle formation.
B
The movement of water across a membrane using ATP-driven pumps to move against the concentration gradient.
C
The diffusion of solute molecules across a selectively permeable membrane from higher solute concentration to lower solute concentration.
D
The diffusion of water molecules across a selectively permeable membrane from lower solute concentration to higher solute concentration.
Verified step by step guidance1
Step 1: Understand the concept of osmosis as a type of passive transport, which means it does not require energy (ATP) to occur.
Step 2: Recognize that osmosis specifically involves the movement of water molecules, not solutes or bulk fluid, across a selectively permeable membrane.
Step 3: Recall that water moves from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration) to balance solute concentrations on both sides of the membrane.
Step 4: Differentiate osmosis from other transport processes such as endocytosis (bulk movement via vesicles) and active transport (which requires ATP and moves substances against their concentration gradient).
Step 5: Conclude that the best definition of osmosis is the diffusion of water molecules across a selectively permeable membrane from lower solute concentration to higher solute concentration.
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